Engine valve mechanism.



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ENGINE VALVE MECHANISM. APPLICATION FILED MAR. 12. 1911.

1,59,728. Patented. Mar. 19,1918.

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ENGINE VALVE MECHANISM.

APPLICATION FILED MAR. 12. 1917.

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ENGINE VALVE MECHANISM.

Specification of Letters Patent.

Patented Mar. 19, 1218.

Application filed March 12, 1917. Serial No. 154,322.

To all whom it may concern:

Be it known that I, SAMUEL FRANK EAs'r- MAN, a citizen of the United States, residing at Petersburg, in the county of Menard and State of Illinois, have invented certain new and useful Improvements in Engine Valve Mechanisms; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to improve upon valve mechanisms of internal combustion engines to such an extent as to render it necessary to keep but one valve properly ground to its seat and in attaining this result, the invention consists primarily of a passage, a single valve for controlling the communication thereof with the engine cylinder, and means synchronized with the movement of the valve for alternately placing said passage in communication with the intake and exhaust.

The nature of the invention and the novel features of construction and combinations of parts involved will be apparent as the description. proceeds with reference to the accompanying drawings which constitute a part of this specification, and in which:

Figure l is a longitudinal section through an engine cylinder showing the improved valve mechanism in the head thereof;

Fig. 2 is an end elevation of the parts shown inFig. 1; and,

Fig. 3 is a detail horizontal section on the plane of the line 33 of Fig. 1.

In the drawings above briefly described, the numeral 1 has reference to an engine cylinder whose outer end terminates in a cylindrical casing 2 having an internal shoulder 3 at its inner end. The usual intake 4 and exhaust 5 communicate with the interior of the casing and are located in a common plane extending transversely of the cylinder, being preferably spaced 90 as shown in Fig. 3.

' A cylindrical hollow passage member 6 is located coaxially in the casing 2 and throughout the greater part of its length is spaced from the wall thereof. At its lower end, however, said passage member and cas ing are threaded together at 9 and a packing ring 10 resting on the shoulder 3 serves to prevent leakage at the joint. Said lower end of the passage member 6 is provided with a valve seat 11 cooperating with a downwardly opening puppet valve 12 carried on the lower end of a stem 13 sliding in a suitable guide 13' carried by the closed outer end of said passage member. The valve 12 operates to control communication between the passage member and the cylinder 1 and by means now to be described, said passage member is alternately placed in communication with the exhaust and intake, said member being provided with ports 14 and 15 which are permitted at the proper time to-communicate respectively with the intake and exhaust.

A. rotary sleeve valve 16 is located in the space between the passage member 6 and the wall of the casing 2, said valve having a port 17 for alternate registration with the ports 14- and 15 to place the passage membcr 6 in communication with the intake 4 and exhaust 5 at proper intervals. The outer end of' the valve 16 is preferably rotatable around a ball or roller bearing 18 although any other type could Well be provided, said end being shown in the present embodiment of the invention as provided with an integral worm gear 19 meshing with a worm 20 on a shaft 21 driven at the proper speed from the crank shaft of the engine. In the multiple cylinder motor, the shaft 21 will extend throughout the length thereof and will operate the valve 16 of each cylinder and will thus do away with the cam shaft and the multiplicity of cams thereon.

The upper side of the worm gear 19 isprovided with an upstanding annular flange 22 concentric with said gear and having an external cam 23 for controlling the rocker arm 24 which is employed for opening valve 12 against the tension of its closing spring 25. The arm 24 is by preference of the arcuate shape shown and is pivotally mounted at 26 on a bracket 27 secured to a suitable fixed part of the engine such as the water jacket 28 of an engine of the water cooled type. Bracket 27 is shown in the present embodiment of the invention as provided with a laterally extending arm 29 overlying the bearing 18 and serving as an abutment for the lower end of the spring 25.

The cam 23 is of such a length as to cause the valve 12 to remain open while the valve 16 establishes communication first with the exhaust 5 and then with the intake 4. It will thus be seen that the exhaust stroke of the usual piston 30 will scavenge the cylinder of spent gases whereas, when said piston again moves inwardly, it will draw a new charge of explosive mixture into the c linder. Valve 12 now closes and compression and ignition take place with it in this position, valve 16 in the meantime turning idly but bein properly in registration with the exhaust %)y the time said valve 12 is again opened as the pistonsta'rts on its exhaust stroke. The engine working in this manner will be highly eflicient and practically noiseless, it being obvious that since but one puppet valve is employed, the noise usually causedby such valves will be reduced to a minimum, thus providing an extremely easy running motor. Furthermore, but one valve need be kept ground to its seat, that is, the valve 12, valve 16 needing no attention whatever except the necessary lubricating which will be provided in any suitable manner. Amon the other advantages is the fact that al? parts of the valve mechanism are easily accessible, being on the outer end of the cylinder and may thus easily be repaired or adjusted when required.

Since the several advantages above pointed out are best attained by the construction shown and described, this arrangement constitutes the preferred form of the imroved valve mechanism but it is to be unerstood that within the scope of the invention as claimed, numerous changes may be made without sacrificing the principal advantages.

I claim 1. In an engine valve mechanism, thecombination of a cylinder havingan intake and exhaust located in approximately the same plane, a passage member fitting into the outer end of the cylinder and having ports for communication with said intake and exhaust, a sleeve valve controlling communication between said ports and said intake and exhaust, means for rotating said sleeve valve, a second valve for controlling com munication between said passage member to the cylinder, said second valve having an operating stem extending through said passage memberand the exterlor thereof, and means for operating said 'stem including a cam rotatable bodily with said sleeve valve.

2. In an engine valve mechanism, the combination of a cylinder having an intake and exhaust located in'approximately the same plane, a passage member fitting into the outerend of the cylinder and having ports for communication with said intake and exhaust, asle ve valve controllin communication between said ports and said intake and witnesses.

3. In an engine valve mechanism, the com-- bination of a cylinder having an intake and exhaust in substantially the same transverse plane, a passage member fitting into the outer end of said cylinder and having ports opposite said intake and exhaust, a rotary sleeve valve surrounding said passage member and having a port for alternate registra tion with the aforesaid ports, a gear carried by the outer end of said sleeve valve and means for rotating said gear, an annular flange carried by the outer side of said gear and concentric therewith, said flange having a cam, a valve for controlling communication between the inner end of the passa e member and the cylinder, said valve havinga stem extending through said passage member to the exterior thereof, and a rocker arm operated from the aforesaid cam for controlling said stem.

4. In an engine valve mechanism, the combination of a cylinder having an intake and exhaust in substantially the same plane, a passage member fitting into the outer end of said cylinder and havin ports disposed opposite said intake and ex aust, a rotary valve sleeve surrounding said passage member and havin a port for alternate registration with the a oresaid ports, means for rotating said sleeve valve, a cam rotatable bodily with said valve, a rocker arm controlled by said cam, a second valve controlling communication between the passage member and the interior of the cylinder and having a stem exteridin through said member to the exterior thereo said stem engaging said rocker arm, a spring surrounding the outer endof said stem for normally .closing the valve thereof, a bracket upon which said rocker arm is mounted, and an extension on said bracket serving as an abutment for said spring.

In testimony whereof I have hereunto set my hand in the presence of two subscribing SAMUEL FRANK EASTMAN.

Witnesses:

JOHN C. SPINK, EDWIN S. WALDMIRE. 

